洞穴碳酸盐有机质荧光发光特征研究及其展望

SPELEOTHEM FLUORESCENT CHARACTERISTICS: THE STATUS QUO OF RESEARCH AND PROSPECT

洞穴碳酸盐是洞穴滴水沉淀的结果,其有机质的荧光性质响应于外界气候与生态环境的高频率、周期性变化,是高分辨率反映气候-环境变化的有效手段。本文详细分析了洞穴碳酸盐荧光物质的组成、来源及影响其荧光光谱的因素,并总结了其分析方法;回顾了国内外在洞穴碳酸盐荧光发光性的古气候-环境研究方面的应用,并对其将来的发展方向作了展望;认为洞穴碳酸盐发光微层及其光谱特征形成机制的现代过程、微层层内物质组成,以及土壤、植被、气候三者响应关系是值得今后进一步加强研究的主要内容。

Speleothems are chemical precipitate of calcite or other minerals deposited in caves from drip-waters. Their fluorescence responds to the high frequent, periodical variations of the climate and ecological environment outside the cave. It's effective way to study high-resolution climatic and environmental changes. In this paper, the component of the fluorescent substance, its sources and the factors that influence fluorescent spectrum of the speleothems are analyzed in detail, and the analytical methods of speleothem fluorescence studying are summarized too. The authors review the applications of speleothems fluorescence in the studying of palaeoclimate and palaeoenvironment over the world and give some suggestions of possible development prospects in this field in the future. It is suggested that researches on the modern processes of the formation mechanisms of speleothem fluorescent micro-banding and spectrum characteristics should be reinforced firstly. It's also suggested that researches on inner-banding components of speleothems and the relations among soil, vegetation and climate are the major contents should be reinforced.